解决安卓全屏“FLAG_FULLSCREEN”状态下“adjustResize”失效，全屏状态下WebView的输入框被软键盘挡住的问题

最新推荐文章于 2023-11-30 17:15:42 发布

翻译最新推荐文章于 2023-11-30 17:15:42 发布 · 6.1k 阅读

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#FLAG_FULLSCREEN #adjustResize #WebView #输入框被软键盘挡住

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本文详细介绍了Android Bug 5497的问题背景、影响及一种有效的解决方法。通过实测验证，提供了一段可直接应用于Activity或Fragment的代码片段，帮助开发者在遇到类似键盘遮挡屏幕高度问题时快速定位并解决问题。建议在Activity/Fragment的onCreate()/onCreateView()中调用AndroidBug5497Workaround.assistActivity(Activity)，以确保应用在不同设备上的正常运行。

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沿着这个问题的线索，可以追溯到： http://code.google.com/p/android/issues/detail?id=5497 ，安卓官方问题回馈帖，这个问题的代号为“ 5497” ，就这个问题帖的回复来看，该问题困惑了许多人数年之久，问题发布日期“ Dec 16, 2009”，现在我在安卓 4.4.2环境运行，这个问题依旧存在。在此推荐这其中的一个解决方法，来自：stackoverflow.com，实测有效。

public class AndroidBug5497Workaround {

    // For more information, see https://code.google.com/p/android/issues/detail?id=5497
    // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.

    public static void assistActivity (Activity activity) {
        new AndroidBug5497Workaround(activity);
    }

    private View mChildOfContent;
    private int usableHeightPrevious;
    private FrameLayout.LayoutParams frameLayoutParams;

    private AndroidBug5497Workaround(Activity activity) {
        FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
        mChildOfContent = content.getChildAt(0);
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            public void onGlobalLayout() {
                possiblyResizeChildOfContent();
            }
        });
        frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
    }

    private void possiblyResizeChildOfContent() {
        int usableHeightNow = computeUsableHeight();
        if (usableHeightNow != usableHeightPrevious) {
            int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
            int heightDifference = usableHeightSansKeyboard - usableHeightNow;
            if (heightDifference > (usableHeightSansKeyboard/4)) {
                // keyboard probably just became visible
                frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
            } else {
                // keyboard probably just became hidden
                frameLayoutParams.height = usableHeightSansKeyboard;
            }
            mChildOfContent.requestLayout();
            usableHeightPrevious = usableHeightNow;
        }
    }

    private int computeUsableHeight() {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);
        return (r.bottom - r.top);
    }

}

在Activity/Fragment的onCreate()/onCreateView()里调用AndroidBug5497Workaround.assistActivity(Activity)；代码搬运，希望能够帮助到各位。感谢答案提供者，祝生活愉快。